freehire launches on Product Hunt on 26 August.

Follow →

Workana Premium

Discussion

Senior .NET Backend Engineer

Open 48d

SalesBlue is a voice AI sales automation platform for insurance brokerages in Mexico and Spain. We build outbound calling systems, campaign orchestrators, and agentic workflows integrating telephony, LLMs, carrier portals, and CRMs. Complex backend, real clients, fast pace environment.

We need a senior .NET/C# engineer who has operated real production systems under load — not just built them. Someone who thinks in architecture first, can design for resilience and scale, and knows what it means to keep a highly integrated backend alive across many moving parts.

Responsibilities

  • Core backend services: campaign orchestrators, FSM-based workflow engines, API integrations with telephony (Twilio), voice AI platforms, insurance carriers, and CRMs.
  • System design and architecture decisions alongside the CTO.
  • Multi-server deployments, async processing pipelines, event-driven flows.
  • Frontend integration via Next.js (familiarity needed, not the focus).

Requirements

  • Deep .NET / C# expertise.
  • Strong CS fundamentals: OOP, SOLID, SOA, design patterns.
  • Experience designing and operating event-driven backend architectures.
  • Experience running systems on multi-server infrastructure with real traffic — you know what horizontal scaling, fail over, and stateless design actually mean in practice.
  • Proficiency with parallel and concurrent programming — async/await, thread safety, queues, etc..
  • Experience integrating many external services/APIs in a single backend — you've dealt with the chaos and know how to tame it.
  • Ability to design backend architecture from scratch for complex web applications.
  • Fluent in AI dev tools: Claude Code, Cursor, GitHub Copilot — part of your daily workflow, not occasional use.
  • Communicates clearly in English; Spanish is a plus.


Nice to have

  • Voice AI / telephony integrations (Twilio, Retell, ElevenLabs, Deepgram).
  • AWS, Vercel, or Railway deployments.
  • Startup experience — comfortable with shifting requirements.

Benefits

  • Compensation in USD.
  • Fully remote work
  • High-growth opportunities in an international company.
Show

What this application asks

workable

First name, Last name, Email, Phone, Address, Experience, Summary, Resume, What is your expected MONTHLY salary in USD as a contractor?, How frequently do you use AI tools in your professional work?, Which statement best describes your current AI usage?, Which AI tools do you use in your daily work and what do you use them for? (Please list the tool and describe its specific use case.)

  • Do you have experience working with C# and .NET (Framework or Core)? yes / no
  • How many years of hands-on experience do you have working as a backend engineer, and could you share some examples of the types of systems you've built or maintained? written answer
  • Do your have experience designing and operating event-driven backend architectures? yes / no
  • Could you tell us about a project where you designed or operated an event-driven backend architecture? What was your approach and what were the outcomes? written answer
  • What is your proficiency level in English? choose one

See also

9,492 jobs
Remote Latam jobs
25,713 jobs
C# jobs
7,863 jobs
Next.js jobs
25,217 jobs
Backend jobs
219,541 jobs
Senior-Level jobs
107,050 jobs
AWS jobs
22,781 jobs
.NET jobs
16,168 jobs
Remote Worldwide jobs
41,760 jobs
JavaScript jobs
58,982 jobs
TypeScript jobs

Tailor your CV for this role?

We couldn't check your fit for this role — add a CV to your profile to see it next time.

A new version of freehire is available